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regex for matching something if it is not preceded by something else

So with regex in java, I want to write a regex that will match if and only if the pattern is not preceded by certain characters. For example: ...
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Unique constraint that allows empty values in MySQL

I have a field that stores product codes. The codes are unique, but some products simply doesn't have a code. I can't invent codes because those are providers codes. ...
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Django fix Admin plural

...me models name from "Categorys" to "Categories" on admin site in the new dev django version? In the old version (whithout admin sites and admin models) you could just do this; http://www.the-dig.com/blog/post/customize-plural-name-django-admin/ ...
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How can I append a string to an existing field in MySQL?

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How do you receive a url parameter with a spring controller mapping

This issue seems trivial, but I can't get it to work properly. I'm calling my Spring controller mapping with jquery ajax. The value for someAttr is always empty string regardless of the value in the url. Please help me determine why. ...
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how to check if List element contains an item with a Particular Property Value

How to check if element of pricePublicList contains certain value. To be more precise, I want to check if there exists pricePublicModel.Size == 200 ? Also, if this element exists, how to know which one it is? ...
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How to change the default font size in ggplot2

...phics, like font size for instance, for a whole R session. The idea is to avoid setting them for each plot. 2 Answers ...
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what does npm -D flag mean?

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Javadoc: package.html or package-info.java

When trying to create package level Javadoc comments, whats the preferred method? What do you do? 1 Answer ...
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Browser support for URLs beginning with double slash

I've recently seen a few links used without a protocol. It didn't seem too difficult to understand - I think it's a great idea and pretty intuitive. ...